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Device
class
Standard
Class
description
Minimum power
allocated to the
powered device
Range of power
delivered to the
powered device
1
PoE and PoE+
Very low
power
4.0W
0.44W–3.84W
2
PoE and PoE+
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7.0W
3.84W–6.49W
3
PoE and PoE+
Mid power
15.4W
6.49W–12.95W
4
PoE+ only
High power
30.0W
12.95W–25.5W
PoE troubleshooting
Here are some tips for correcting PoE problems that might occur:
•
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disconnect one or more PoE devices to prevent PoE oversubscription. Start by
disconnecting the device from the highest-numbered port.
• Make sure that the Ethernet cables are plugged in correctly. For each
powered device (PD) that is connected to the switch, the corresponding right
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yellow, a PoE fault occurred and PoE halted because of one of the conditions
that are listed in the following table.
PoE Fault Condition
Possible Solution
A PoE-related short circuit occurred on the
port.
The problem is most likely with the attached
PD. Check the condition of the PD or restart the
PD by disconnecting and reconnecting the PD.
The PoE power demand of the PD exceeded
the maximum level that the switch permits,
which is 30.9W.
The PoE current on the port exceeded the
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The PoE voltage of the port is outside the
range that the switch permits.
Restart the switch to see if the condition
resolves itself.
December 2019
